In an experimental investigation, the group that is not manipulated by the researcher and is then compared to the experimental group is called the group.

Control

Explanation:

In any experiment there is an experimental group and a control group. Experimental group is the main focus of our experiment. The independent variable is changed here and the effect is checked on dependent variable.

Control group's independent variable is either kept constant or controlled. The main purpose of control group is to rule out other factors except the dependent variable which might have an effect on the experiment's result. After the experiment is completed, experimental and control group's results are compared to each other.

b

is correct hope this   also i learnd this in middle school

the answer is b: 1.4 km/hr